This map is based on research-front data for the six-year period ending in
June 2009. The map shows the major subject areas within fields linked together
in a network based on the same principles as our research-front maps showing
highly cited papers. To create a map of science, we start with all research
fronts in Essential Science IndicatorsSM
from Thomson
Reuters, and compute the links between fronts based on how often they
are co-cited—that is, the frequency that current papers jointly cite two given
fronts. Successive applications of a clustering process then groups fronts into
larger aggregates. Each circle on the map represents a cluster or aggregate of
research fronts on a broad topic within that field. Annotations have been added
to this map which represent the main research themes. These appear as labels
attached to specific regions on the maps. View
additional information about Research Fronts.